Created
February 23, 2018 19:08
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import Foundation | |
class HTTPResponseHandler<T: Decodable>: ResponseHandler { | |
typealias ResultValueType = T | |
private var isResponseRepresentSimpleType: Bool { | |
return | |
T.self == Int.self || | |
T.self == String.self || | |
T.self == Double.self || | |
T.self == Float.self | |
} | |
var errorHandler: ErrorHandler = BaseErrorHandler() | |
var successResponseChecker: SuccessResponseChecker = BaseSuccessResponseChecker() | |
var decodingProcessor = ModelDecodingProcessor<T>() | |
var nestedModelGetter: NestedModelGetter? | |
func handleResponse(_ response: ResponseRepresentable, completion: (Result<T>) -> ()) { | |
if successResponseChecker.isSuccessResponse(response) { | |
processSuccessResponse(response, completion: completion) | |
} else { | |
processFailureResponse(response, completion: completion) | |
} | |
} | |
private func processSuccessResponse(_ response: ResponseRepresentable, completion: (Result<T>) -> ()) { | |
guard var data = response.data else { | |
return | |
} | |
if let nestedModelGetter = nestedModelGetter { | |
if let escapedModelJSON = try? nestedModelGetter.getFrom(data) { | |
if isResponseRepresentSimpleType { | |
if let result = simpleTypeUsingNestedModelGetter(from: data) { | |
completion(.Value(result)) | |
return | |
} | |
completion(.None) | |
return | |
} else { | |
guard let model = escapedModelJSON[nestedModelGetter.escapedModelKey] else { | |
completion(.None) | |
return | |
} | |
if model is JSON { | |
guard let serializedData = try? JSONSerialization.data(withJSONObject: model, options: []) else { | |
completion(.None) | |
return | |
} | |
data = serializedData | |
} else { | |
completion(.None) | |
return | |
} | |
} | |
} | |
} | |
guard let result = try? decodingProcessor.decodeFrom(data) else { | |
completion(.None) | |
return | |
} | |
completion(.Value(result)) | |
} | |
private func simpleTypeUsingNestedModelGetter(from data: Data) -> T? { | |
let getter = nestedModelGetter! | |
guard let escapedModelJSON = try? getter.getFrom(data) else { | |
return nil | |
} | |
guard let result = escapedModelJSON[getter.escapedModelKey] as? T else { | |
return nil | |
} | |
return result | |
} | |
private func processFailureResponse(_ response: ResponseRepresentable, completion: (Result<T>) -> ()) { | |
errorHandler.handleErrorResponse(response) { (error) in | |
completion(.Error(error)) | |
} | |
} | |
} |
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